Topological hall transport: Materials, mechanisms and potential applications

Wang, Han; Dai, Yingying; Chow, Gan Moog; Chen, Jingsheng

doi:10.1016/j.pmatsci.2022.100971

Cited by 33 publications

(34 citation statements)

References 254 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In weak coupling case, especially in the diffusive regime, the condition of adiabatic picture fails, and nonadiabatic contribution needs to be taken into account. Theory predictions of nonadiabatic effect have been made [28,33], while experimental confirmation is still lack [44]. In this paper, our theory has been simplified and based on strong exchange interaction where the emergent topological field is an averaged component perpendicular to the 2D plane, and the dispersion of conduction electron is chosen to be quadratic.…”

Section: And Discussionmentioning

confidence: 99%

“…Then topological Hall effect has been studied theoretically in [28][29][30][31][32][33][34][35][36], where spin-flip scattering [32,35] and the evolution from strong exchange coupling to weak exchange coupling [28] are explicitly considered. To date the topological Hall effect has been experimentally observed in a vast range of materials [37][38][39][40][41][42][43], summarized in a recent review [44]. They include ferromagnetic semiconductors, magnetic Kagome lattices, transition-metal oxides, SrRuO 3 -based materials, transition metal compounds, Heusler compounds, and magnetic topological insulators, among others [45][46][47][48].…”

Section: Introductionmentioning

confidence: 99%

“…They include ferromagnetic semiconductors, magnetic Kagome lattices, transition-metal oxides, SrRuO 3 -based materials, transition metal compounds, Heusler compounds, and magnetic topological insulators, among others [45][46][47][48]. Topological spin textures that might produce topological Hall effect include Bloch-type skyrmions induced by bulk Dzyaloshinskii-Moriya interaction (DMI), Néel-type skyrmions mainly associated with interfacial DMI, scalar spin chirality generally originated from geometrical frustration interaction, and noncollinear magnetism and bubble caused by the competition of various magnetic interactions including magnetocrystalline anisotropy, demagnetization and exchange interaction [44].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Coherent backscattering in the topological Hall effect

Hong

Burgos

Medhekar

et al. 2023

Mater. Quantum. Technol.

View full text Add to dashboard Cite

The mutual interplay between electron transport and magnetism has attracted considerable attention in recent years, primarily motivated by strategies to manipulate magnetic degrees of freedom electrically, such as spin-orbit torques and domain wall motion. Within this ﬁeld the topological Hall eﬀect, which originates from scalar spin chirality, is an example of inter-band quantum coherence induced by real-space inhomogeneous magnetic textures, and its magnitude depends on the winding number and chiral spin features that establish the total topological charge of the system. Remarkably, in the two decades since its discovery, there has been no research on the quantum correction to the topological Hall eﬀect. Here we will show that, unlike the ordinary Hall eﬀect, the inhomogeneous magnetization arising from the spin texture will give additional scattering terms in the kinetic equation, which result in a quantum correction to the topological Hall resistivity. We focus on 2D systems, where weak localization is strongest, and determine the complicated gradient corrections to the Cooperon and kinetic equation. Whereas the weak localization correction to the topological Hall eﬀect is not large in currently known materials, we show that it is experimentally observable in dilute magnetic semiconductors. Our theoretical results will stimulate experiments on the topological Hall eﬀect and ﬁll the theoretical knowledge gap on weak localization corrections to transverse transport.

show abstract

Section: And Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Coherent backscattering in the topological Hall effect

Hong

Burgos

Medhekar

et al. 2023

Mater. Quantum. Technol.

View full text Add to dashboard Cite

show abstract

“…This unusual peak can also be induced by the compositional inhomogeneity in rare-earth transition-metal ferrimagnetic alloys, e.g., the Co x Gd 1−x alloy thin films in which Co and Gd show opposite sign of AHE [20]. Several reviews have recently appeared that summarize experimental observations of this peak in various materials as well as its potential origins [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Two-channel anomalous Hall effect originating from the intermixing in Mn2CoAl/Pd thin films

Zhang

Granville²

2022

Phys. Rev. B

View full text Add to dashboard Cite

The anomalous Hall effect (AHE) is an electronic transport phenomenon with rich physics. In thin magnetic films and multilayers, an unusual peak observed in AHE is often identified as the topological Hall effect (THE), induced by topologically nontrivial spin textures. However, it is a challenge to determine whether this unusual peak truly originates from such spin textures or is an artifact due to inhomogeneities. In this work, we systematically study the Pd thickness and temperature dependence of the Hall effect in Mn 2 CoAl/Pd thin films. We observe an unusual peak in the Pd thickness dependence and rule out that the origin of the peak is from the topologically nontrivial spin textures by directly imaging the magnetic domain structures. We also build a model for the AHE based on the sum of contributions from Mn 2 CoAl and an intermixed CoPd alloy. These materials have opposite signs of the AHE and different coercive fields, which successfully explains the thickness and temperature behaviors of the unusual peak. Our results show that the interface mixing layer can play an important role in the interpretation of the AHE in ferromagnet/heavy metal systems.

show abstract

“…39,42,43 Studies of skyrmions in two-dimensional chiral metallic magnets have unveiled their strong impact on electron transport properties, [44][45][46][47][48][49] and more generally have opened up an avenue towards magnetic topological materials. 50,51 Particularly, the topological Hall effect, one of the most striking properties of these systems, was shown to occur in the response to nonuniform and noncoplanar magnetization. Nonzero scalar spin chirality endows it with properties distinct from those of the anomalous Hall effect that stems from the magnetic interaction between the localized and itinerant electrons even for collinear ordering.…”

Section: Introductionmentioning

confidence: 99%